You get to keep only enough to maintain a very modest lifestyle in a low-cost-of-living area, the rest of it has to go towards improving the world in some way.
Edit: Given the previous rules that you must maintain a very modest lifestyle in a low-cost-of-living area, would you rather choose to opt out and not have the money at all?
Wholesale murder of my fellow billionaires
Great idea! But what happens then? There’d be some fear, but more importantly, a certain vacuum of power. How could you make sure another power-hungry, sociopathic populist wouldn’t rise? Or, again more importantly, make sure people cannot fall into these traps again, which only happens due to a lack of ideology, generalized ignorance and a belief in ‘moral relativism’ (among other issues)?
Btw, Frank Herbert explored this in Dune… it requires a virtually immortal prophet! 😅
Not my problem because I would have to die too.